This is a genuine manufacturer-sourced replacement part which is specially designed for use with Shindaiwa and Echo handheld lawn and garden equipment. It is a standard hardware which has multiple applications depending on the model of your unit, please make sure to check appropriate diagrams for the correct location and use of this item. Keep in mind this durable metal screw is sold individually, you will need a hex key also known as an Allen wrench to secure or remove it.